team_slave_0: entered allmulticast mode
team_slave_1: entered allmulticast mode
bridge0: port 3(team0) entered blocking state
bridge0: port 3(team0) entered forwarding state
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 5958 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 5958 Comm: syz.0.8 Not tainted 6.14.0-syzkaller-13320-g420aabef3ab5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28
Code: 60 65 a1 8c e8 77 b2 7d fc 90 0f 0b 90 90 eb 99 e8 3b 92 be fc c6 05 2c 07 45 0b 01 90 48 c7 c7 c0 65 a1 8c e8 57 b2 7d fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 18 92 be fc c6 05 06 07 45 0b 01 90
RSP: 0018:ffffc90003f4f538 EFLAGS: 00010246
RAX: d1abbc9885d02500 RBX: ffff8880294a8c78 RCX: ffff888025d58000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff81827a12 R09: 1ffff110170e47d2
R10: dffffc0000000000 R11: ffffed10170e47d3 R12: ffff8880294a8c60
R13: ffff888025d58000 R14: ffff888027aaa800 R15: ffff8880294a8c60
FS:  0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc729064440 CR3: 0000000029490000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 klist_dec_and_del+0x3ec/0x3f0 lib/klist.c:206
 klist_put lib/klist.c:217 [inline]
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x229/0x3f0 lib/klist.c:249
 device_move+0x1b4/0x710 drivers/base/core.c:4592
 hci_conn_del_sysfs+0xb5/0x170 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline]
 hci_conn_del+0x8d5/0xc50 net/bluetooth/hci_conn.c:1167
 hci_conn_hash_flush+0x18e/0x240 net/bluetooth/hci_conn.c:2702
 hci_dev_close_sync+0xa8d/0x1260 net/bluetooth/hci_sync.c:5225
 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
 hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2678
 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:665
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa11/0x27f0 kernel/exit.c:953
 do_group_exit+0x207/0x2c0 kernel/exit.c:1102
 get_signal+0x1696/0x1730 kernel/signal.c:3034
 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4fded8d169
Code: Unable to access opcode bytes at 0x7f4fded8d13f.
RSP: 002b:00007f4fdcbd5038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 000000000000002e RBX: 00007f4fdefa6160 RCX: 00007f4fded8d169
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000005
RBP: 00007f4fdee0e730 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f4fdefa6160 R15: 00007ffdd5af4778
 </TASK>